Driving means for centrifugal bowls



M. LEITCH.

DRIVING MEANS FOR CENTRIFUGAL BOWLS. APPLICATION FILED JUNE 6. 1919.

1,373,085. Patented Mar. 29,1921.

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M/VE/W'OA W/ r/vsss; Mitzi/7% Lca'icfi Wm g er ATTORNEY.

UNITED STATES PATENT-- .oFrlcE.

-MEREDITH LEITGH, orrouonxnnr'sm, New You, ASSIGNOB 'ro 'rnn mi: 14w, sErARAroP. com-ANY, or -New YORK, 1w. 1, a CORPORATION or NEw JERSEY,

DRIVING- MEANS FOR CEKTBIF'UGAL BOWLS.

To all whom it may' concern:

Be it known that I, MEREDITH l ni ron, a citizen of the United States,res1d1n at Pou hkeepsie,countyof Dutchess, and 'tate of ew York, have invented a new and useful Improvement in Driving Means for (lentrifugal Bowls of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a part of this specification.

My invention is an improvement in means for mounting centrifugal bowls on, [and driving them by, the spindles of their machines.

My object is to provide a mounting and driving means in which there is no tendency to cause eccentricity or misalinement of the bowl with the spindle and yet in which there will always be a sufiicient drivin force.

In my patent application file drive which depends entirely on the friction between a taper cone of a non-seizing angle on the spindle and a socket of a similar angle in the bowl." This for many condltlons is weight bowls having a large capacity, there may not be friction enough to drive the bowl with liquid flowing through it. With such bowls I make use of the auxiliary driving means described in the present invention.

In the accompanying drawings, which illustrate a preferred embodiment of my invention,

Figure 1 is an elevation, partly in section, of acentrifugal bowl, the upper portion of the spindle on which it is mounted, and the driving means between them.

Fig. 2 isa vertical section of the upper portion of the spindle,'the part of the bowl 1n immediate contact therewith, and the driving means.

Fig. 3 is a cross-section on the line 3--3 of Fi 2.

liig. 4 is a crosssection, on a still larger scale, of the spindle alone.

a is a bowl spindle having a tapered upper end and supported and driven in the usual.

speciflcatien' o! Ilett ers Patent.

provi ed with a bushing'h closely fitti April 30, 1919, Serial No. 239,640, I set forth a bowl bowls by centrifu al clutches.

material in cavities -material'flof the weights efitends and sur rom' the bottom of the rounds the necksel j I bowl extends upwardga hollow shaft g,

I the sp ndle a; In'the upper end of the bus ing it 1s secured a plugi having a taper socket adapted to fit t e taper end of the spindle a. Underneath each of the heads (1 of the rivets 0 1s a clearance space j which permits a $11 ht outward movementof the weights.

n the manufactureof the described centrifugally engageable clutch, I prefer to proceed by cutting out the cavities, boring the I a ented Mar. 29, 1921. I Application filed June a, 1919.' S r1 1 308mm v rivet holes between opposite cavities, lacing the rivets c centrally in the holes, castin the weights 6 in the cavities, around the rivets and under thelr heads, and then forcing the rivets longitudinally a short distance first toward one side and then toward the other, thereby compressing the metal under the heads and providing the described clearances to ermit outward movement of the weights.

he most used method of-drivin a centrifugalbowl is by having a part 0 the top of the splndle cut away to form a member which, in combination with a mating memher in the bowl, forms a'positive clutch. y

This has two serious faults. When the bowl is placed on the splndle, it must be carefully after engagement the jaws, or equivalent, of the clutch have, because of unavoidable slight irregularities in manufacture, a tendency to throw the bowl out of concentricity with the spindle, causing rough runmng.

I know that it is old to drive centrifu al All clutc es previously made or this purpose have been of such large size as to make necessary an increased distance between the top bearin of the spindle and the bottomof the bow The movable parts at large diameter are also liableto have unequal radial movements and consequentl throw the whole revolving mass out of alance. I know, also, that it is old to support a centrifu a1 bowl on a ta or or conically ended spin 1e, but when this taper is made so blunt that the bowl can turned around until the clutch engages, and K adapted, as the speed of rotation be. easily'removed, there is danger that the bowl Wlll slip when the greatest power 1s re uired.

n my improved construction I provide a spindle having at its top a portion with a taper blunt enough to insure easy removal of the bowl but still acute enou h to insure the friction required to gradualIy bring the empty bowl up to speed, and below the taper portion a cylindrical portion havlng centrifugally engageab'le friction members normally entirely within the cylindrical portion. I provlde the bowl with a cyhndrical bushing closely fitting the cylindrical portion of the spindle and having at 1ts upper end a plug with a taper socket portion of the spindles.

In operation, the bowl is vplaced on the spindle, in any rotational position, and the machine started. The friction of the taper portion will gradually start the bowl. As

the speed of the spindle increases the weights b, b, will press outward against the bushing h and cause a friction that will greatly increase'the driving force. Because the outside surfaces of the weights form part of the cylindrical surface of the spindle and because the bushing h closely fits the spindle, the actual movement of the weights is so small as to have no effect on the balance of the device; 7 Because the weights are entirely within the normal diameter of the spindle "and are inside the bowl, the deviceinterferes in no way with ingIclos'e to the bowl.

aving now fully described my invention, what I claim and desire to protect by Letters Patent is:

1. In driving means for centrifugal bowls,

placing the top bearthe combination with the supporting and driving spindle having clutch receiving cavities, of a bowl having a cylindrical-spindle receiving-socket adapted to inclose said cavities and spindle and closely fit the spindle along that part of the length thereof in which the cavities, are formed, and a centrifugally operable friction clutch normally entirely within the spindle and radially movable to frictionally engage the surrounding wall of the socket.

2. In driving meansfor centrifugal bowls, the combination with the bowl, of a supporting and driving spindle, means to frictionally drive the bowl from the spindle, and an independent centrifugally o rable friction member carried by the spindle and of the bowl increases, to move into frictional drivlng engagement with the bowl.

to fit the taper 3. Driving means for centrifugal bowls comprising a spindle having a friction cone of a non-seizing angle and a centrifugally engageable friction clutch normally entirely within the-spindle.

4:. In driving means for centrifugal bowls, the combination with thebowl, of asupporting and driving spindle, said bowl and spindle having coacting conical bearing surfaces by means of which the bowl is started torotate with and on the axis of the spindle, and a centrifugally operable friction member adapted, as the speed of the spindle and bowl increases, to create a friction between the bowl and s indle and thereby substantially increase the driving force.

5. Driving means for centrifugal bowls comprising, in combination, a spindle having symmetrically located cavities, weights normally just filling said cavities, and weight retaining devices adapted to permit slight outward movement of the weights under centrifugal force.

6. In driving means for centrifugal bowls,

the combination with a bowl having an axial spindle-receiving socket comprising a lower cylindrical portion and an upper conical portion, of a supporting and driving spindle having a cylindrical portion and a tapered portion adapted to substantially fit said socket, and centrifugally engage-able friction members normally within the spindle but ada ted, under centrifu al force, to press outward against the Wall 0% the bowl socket.

7 In driving means for centrifugal bowls, the combination, with the bowl, of a supporting and driving spindle, said bowl and spindle having coacting conical bearing faces by means of which the rotation of the bowl is started, and centrifugally operable members normally within the spindle but slightly movable radially under centrifugal force to create the friction required to continue the driving of the bowl under op erative conditions at high speed.

8. In driving means for centrifugal bowls, the combination with a bowl having a hollow shaft, a bushing within the shaft, and a conical'ly socketed plug closing the upper end of the bushing, conical upper end adapted to closely fit said bushing and plug, and centrifugally en ageable friction members carried by the spindle and entirely surroundable by said bushing.

In testimony of which invention, I have hereunto set my hand, at Poughkeepsie, N. on this 29th day of May, 1919.

MEREDITH LEITCH. 

